Peter Norvig refers to research showing 10 years of work required to hit expert level in his essay "Teach Yourself Programming in 10 years" (http://norvig.com/2

Peter Norvig refers to research showing 10 years of work required to hit expert level in his essay "Teach Yourself Programming in 10 years" (http://norvig.com/21-days.html http://norvig.com/21-days.html). No references to "10,000hours" other than Gladwell I think.